Britney Spears and Kevin Federline's lawyers were in court Monday to finalize the divorce between the failed pop singer and the failed rapper.

Britney's attorney Laura Wasser and K-Fed's man Mark Vincent Kaplan began the proceedings in Los Angeles County court early Monday expected to end by the close of business.

TMZ.blog is reporting that Wasser is asking that all of the custody and spousal support details be kept top secret.  You know, Britney, she has to be all top secret!  Ha ha ha ha!

Here's what TMZ knows: K-Fed is pulling in 15K a month from Britney for child support. He's also getting 20 grand a month in spousal support, but that's based on the prenup, and it appears the alimony gravy train will come to a screeching halt in November.

As for custody, we've learned it will stay at 50/50. It's amazing disso-queen Wasser was able to get a 50/50 custody split given Brit's craziness, which included wild partying, erratic behavior and a stint in rehab. This type of custody arrangement is typically reserved for a stable couple.

But all is not over! We're told neither Brit nor Fed-Ex are happy with the custody arrangement, and either of them can go back to court and ask for a change. On top of that, Kevin won't even speak to Spears, so they will probably be back in court asking the judge to make decisions about child rearing.

One more thing: There are reports K-Fed will go to court as early as this week to get full custody. That doesn't make a lot of sense that he'd go for broke, since our sources say K-Fed has signed-off on the 50/50 custody split. He may not be happy, but it doesn't seem he's ready for all-out war either.

More drama for Britney is brewing!